20, although if you reduced 15/20 to 3/4, the common denominator would be 4.
The greatest common denominator is an infinite amount.
LCD(49, 35, 5) = 245
180
140
LCD(12, 20) = 60
7/15 = 28/60 19/20 = 57/60
The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.
The least common denominator (LCD) is 1.
60
4/9 = 20/45 8/15 = 24/45
A common denominator, though not the least one, is 200.
300
60
LCD(8, 20, 15) = 120
20 is.
The is no "largest" common denominator. For any denominator you find, we can multiply it by a natural number and come up with a larger one. Do you mean LEAST COMMON DENOMINATOR?
Least common denominator is used for fractions, not integers. Integers can be expressed as fractions, though, by placing them over 1 so if you really meant least common denominator then the answer is 1. If, however, you meant least common multiple, then then answer is 60.